Python对象模型

模型属性变更

注意

支持级别: 尚不支持

原版源代码：

# mypy: allow-untyped-defs
import torch
from torch._export.db.case import SupportLevel


class ModelAttrMutation(torch.nn.Module):
"""
    Attribute mutation is not supported.
    """

    def __init__(self) -> None:
        super().__init__()
        self.attr_list = [torch.randn(3, 2), torch.randn(3, 2)]

    def recreate_list(self):
        return [torch.zeros(3, 2), torch.zeros(3, 2)]

    def forward(self, x):
        self.attr_list = self.recreate_list()
        return x.sum() + self.attr_list[0].sum()


example_args = (torch.randn(3, 2),)
tags = {"python.object-model"}
support_level = SupportLevel.NOT_SUPPORTED_YET
model = ModelAttrMutation()


torch.export.export(model, example_args)

结果：

AssertionError: Mutating module attribute attr_list during export.

可选输入

注意

标签: python对象模型

支持级别: 尚不支持

原版源代码：

# mypy: allow-untyped-defs
import torch
from torch._export.db.case import SupportLevel


class OptionalInput(torch.nn.Module):
"""
    Tracing through optional input is not supported yet
    """

    def forward(self, x, y=torch.randn(2, 3)):
        if y is not None:
            return x + y
        return x


example_args = (torch.randn(2, 3),)
tags = {"python.object-model"}
support_level = SupportLevel.NOT_SUPPORTED_YET
model = OptionalInput()


torch.export.export(model, example_args)

结果：

Unsupported: Tracing through optional input is not supported yet